<!DOCTYPE html>
<title>Service worker intercepts a navigation and starts prerendering</title>
<meta name="timeout" content="long">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/utils.js"></script>
<script src="/service-workers/service-worker/resources/test-helpers.sub.js"></script>
<body>
<script>
const PAGE_URL = 'resources/non-existent-page.html?should-intercept';
const WORKER_URL = 'resources/fetch-intercept-worker.js';

promise_test(async t => {
  const registration =
    await service_worker_unregister_and_register(t, WORKER_URL, PAGE_URL);
  t.add_cleanup(() => registration.unregister());
  await wait_for_state(t, registration.installing, 'activated');

  const bc = new BroadcastChannel('prerender-channel');
  t.add_cleanup(_ => bc.close());

  const gotMessage = new Promise(resolve => {
    bc.addEventListener('message', e => {
      resolve(e.data);
    }, {
      once: true
    });
  });

  startPrerendering(PAGE_URL);

  const result = await gotMessage;
  assert_equals(result, 'prerender success');
}, 'navigation should be intercepted by a service worker');

</script>
</body>
